In situ SEM observations of the contrasting effects of an overload on small fatigue crack growth at two different load ratios in 2024-T351 aluminium alloy

Halliday, M. D.

doi:10.1016/s0142-1123(97)00010-8

Cited by 32 publications

(11 citation statements)

References 25 publications

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“…More recent in situ SEM observations by Halliday et al 16 . essentially confirm the observations of Ref.…”

Section: Simulation Proceduressupporting

confidence: 84%

A numerical investigation on the effect of an overload on fatigue crack opening and closure behaviour

Ellyin

1999

Fatigue Fract Eng Mat Struct

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The effect of a superimposed single tensile overload or a compressive overload in a block of constant‐amplitude cycles on the crack opening and closing stresses is investigated using an elastic–plastic finite element analysis. The results obtained are in basic agreement with the experimental observations. Following an applied tensile overload cycle, the crack opening and closing stresses increase instantaneously, while the imposition of a compressive overload cycle results in a small decrease of the crack opening and closing stresses. A detailed discussion of the residual stress and strain patterns caused by the plastic deformation during the overload cycle and the corresponding crack profiles is included. The main governing mechanism resulting in the change of crack growth due to an overload is pointed out.

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“…More recent in situ SEM observations by Halliday et al 16 . essentially confirm the observations of Ref.…”

Section: Simulation Proceduressupporting

confidence: 84%

A numerical investigation on the effect of an overload on fatigue crack opening and closure behaviour

Ellyin

1999

Fatigue Fract Eng Mat Struct

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“…On the other hand, temporary arrest following an overload has been observed for an apparently sharp crack tip by [57]. It also has been observed that both crack growth acceleration under spike underloads and crack growth retardation under spike overloads are accompanied by crack tip blunting [58,59]; hence the contribution of crack blunting to immediate retardation is not clear, rather than causing non-closure of the crack tip upon application of overload, leading to a brief increase in fatigue crack growth rates just after the application of overload [9,19,44,[60][61][62].…”

Section: Crack Tip Bluntingmentioning

confidence: 99%

Variable amplitude fatigue crack growth behavior — a short overview

2011

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A short overview concerning variable amplitude (VA) fatigue crack growth behavior is presented in this paper. The topics covered in this review encompass important issues pertaining to both single and repeated overload transients. Reviews on transient post overload effects such as plasticity induced crack closure, crack tip blunting, residual stresses, crack deflection and branching, activation of near threshold mechanisms, strain hardening are highlighted. A brief summary on experimental trends and finite element modelling of overload induced crack closure is also presented.

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“…The results obtained from these analyses can be validated by identifying the acceleration effect in compress stress spectra of other experiments. [4][5][6][7][9][10][11]68 The reason why there is a difference in the results given by the Forman and NASGROW equations is that the Forman equation calculates crack propagation lengths by LEFM procedures and neglects the load sequence effect for the threshold SIF range ( K th ) and retardation effect. In contrast, the NASGRO equation considers the stress level effect through the K th concept.…”

Section: Analysis Of Multiple Cracks For Compressive Stress Effectmentioning

confidence: 99%

“…1 It is well recognized that load bearing structural components rarely experience loading amplitudes that remain constant during the length of the service. Halliday et al 6 found that for the aluminium alloy 2024-T351 tensile overload does not have any effect on fatigue crack growth rate at R = -1, but has a significant retardation effect at R = 0.05. A major influencing parameter to be considered is load history, which is usually variable.…”

Section: Introductionmentioning

confidence: 99%

“…Tack and Beevers 5 had also observed that in steels the fatigue crack propagation rate under a negative stress ratio (R < 0) is greater than for R = 0.1. Halliday et al 6 found that for the aluminium alloy 2024-T351 tensile overload does not have any effect on fatigue crack growth rate at R = -1, but has a significant retardation effect at R = 0.05. Pommier 7,8 observed that for a N18 superalloy there is a strong compressive loading effect on the fatigue crack propagation rate.…”

Section: Introductionmentioning

confidence: 99%

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The effect of compression stresses, stress level and stress order on fatigue crack growth of multiple site damage

Kim

Chau-Dinh

et al. 2012

Fatigue Fract Eng Mat Struct

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Structural components are generally subjected to a wide stress spectrum over their lifetime. Service loads are accentuated at the areas of stress concentration, mainly at the connection of components. When there is a critical level of multiple site damage at connections, cracks link up to form a large crack which abruptly reduces the residual strength of the damaged structural member. Therefore, it is important to estimate the fatigue life before the cracks link up due to critical multiple site damage. In this study, the extended finite element method was applied to predict lifetime under constant amplitude cyclic loadings of fatigue tests on several multiple site damage specimens made of Al 2024‐T3. Then the multiple crack growths under service stress spectra are calculated to investigate the effects of compressive stress, stress orders and the effect of sequence cyclic loadings on stress levels by using Forman and NASGROW equations.

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In situ SEM observations of the contrasting effects of an overload on small fatigue crack growth at two different load ratios in 2024-T351 aluminium alloy

Cited by 32 publications

References 25 publications

A numerical investigation on the effect of an overload on fatigue crack opening and closure behaviour

A numerical investigation on the effect of an overload on fatigue crack opening and closure behaviour

Variable amplitude fatigue crack growth behavior — a short overview

The effect of compression stresses, stress level and stress order on fatigue crack growth of multiple site damage

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